Centrifugal casting machine



l .,F. WOLF. CENTRIFUGAI. CASTING MACHINE.

APPLICATION FILED MAR. 30, 1921.

. Patented'Aug. 15,1922.

2 SHEETS-SHEET l.

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|III-IIIIIIH" .l'- I W. F. WOLF.

CENTRIFUGAL CASTING MACHINE.

APPLlcATxoN mgm MAR. 30. 1921.

1,425,927, i Patented Aug; 15, 1922.

2 SHEETS-SHEET 2.

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' To all whom it may concern.'

orifice.

`WILLIAM F. WOLF, OF SOMERVILLE, NEW JERSEY, SSIGNOR. TO- WASSON PSTON' RING COMPANY, 0F PLAINFIELD, NEW JERSEY, A CORPORATION 0F NEWJERSEY.

CENTRIFUGAL cAs'rING iirncnlinii.l

Specification of Letters Paten-t. Patented Ajug.. 15,

' Application led ltlarch 30, 1921. Serial No. 456,876.l v y Y Be it known that I, WILLIAM F.l WOLF, a vcitizen of the United.' States, and a resident of Somerville, in thel county -of Somerset, in the State of New Jersey, have invented certain new and useful Improvements in Centrifugal Casting Machines, of which the following is a specification, reference be-p ing made to the accompanying' drawings, forming a part thereof. Y

lMy invention relates to those machines devised to produce centrifugal castings, more particularly in providing improvements in rapid-production methods and machines for casting annular members,l such aspistonrings, inl groups and at arapid rate with a uniform texture of metal in the 'completed ring. -I y The objects of my invention are, among other things, to provide an improved machine of this character in which the individual ,cores forming the molds for producing the rings may serve to form three sides .of the completed ring while the subjacent core forms the fourth side, and also to provide the annular mold spaces with connecting gates. or passages through which the molten metal rises and distributes itself in the ring mold with such shapes and arrangement with respect. to such molds as to afy ford not only an even distribution of the molten metal but also reservoirs of greaterv section than the rings which are fed therefrom, so that in cooling with accompanying shrinkage the ring-metal within the ring molds proper may draw any required metal from such'reservoir passages, thereby producingI groups of rings of uniform thickness and having great homo-geneity, and also A,

avoiding the usual imperfections arising from disadvantageous shrinkage caused vby- .the rapid production of annular castings lin groups wherein the assemlb'led cores of predetermined size and contour shall provide the requisite annular molds for such piston-rings in coacting relationship with 7. one another. v .Further advantages and rfunctions will hereinafter be more particularly set forth, and a preferred embodiment of my invent1on is illustrated in the accompanying drawings in which Fig. 1 is a vertical section of my improved machine showing the mold and arrangement of cores, the mechanism for revolving the rotatable'table being shownpartly in front elevation y Fig.l 2 is a vertical section showing the mold core cavities filled with metal and also an annular film of metal within the central trough;

' Fig. 3 is a sectional view taken on the line 3-.3 of Fig. 1 looking inthe direction of the arrows;

Fig. 4 is a top plan view of a nest of cores v Fig. 5 is a bottom plan View of the bottom' layer of cores;

Fig. 6 is a, layer of cores;

Fig.v 7 is atopplan ings when removed from the molds. vand Fig. 8 vis'a detail sectional viewwtaken on the line 8-8 of Fig. 7 looking in the direction of the arrow.

Similar numeralsrefer-to similar parts throughout. the several figures.. Referring to Figs. 1 and 2, the 9 supports the standard 10.having the horizontal bracket 11. .Within the plate 9 is formed the journal .bearing 12 while `the view of the ring castbase plate bottom plan-view ofthe topy bracket 11 also carriesthe journal bearing 13 in vertical alinement with the bearing 12.

Rotatably mounted in the -bearings'12 and 13 1s the spindle 14.upon the upper'end of which is secured thc-table 15 upon which is cating lpin 17 passing through the table 1.5

and resting-in the head of the spindle 14 as shown in Fig. 41. A suitable cover 18 having thev central opening 19 is detachably secured to the topvof the mold flask 16 by the f screw bolts v20. Rotation'is imparted to the spindle 14 through the pulley 21by means of the belt 22 passing around the pulley 23 and pulley 21 asshown in Fig. 1, the belt 22 be carried the circular mold flask 16-by the loy F'igsfl and-2, thevarious details'offvvhich arrangements are shown in Figs. 3, 4, 5 and 6. 1n the bottom of' the flask 16 is placed the flat circular lining plate 24 which covers the entire bottom of such flask. Upon this plate 24 I preferably arrange the different layers of' segmental cores, the bottom layer being shown in Fig.' 5. rThese cores are herein shown as comprising six to the layer, and are indicated in the drawings by reference numerals 25, 26, 27, 28, 29 and 30. Each of these cO-res has the circular channel 31 formed therein to provide the necessary segment of the ring casting the channels 31 of all six cores forminga complete annular space for the ring of any desired size or cross-sectional thickness. It will lbe noted that the core surfaces about the channels 31 form three sidesA of the rectangular ring casting While the fourth side is formed by the top surface ofthe plate 24. Referring more particularly to Fig. 5, each of the cores 25, 26, 27, 2829 and 30 has formed in lower surface a cut-out portion 32 with a vertical channel or riser 33, which portion 32 and channel 33 comprise one-half of a lower gateway for the molten metal to flow into the three vertical channels or risers 33 from.' which the metal is centrifugally driven into the ring channel 31 through the passages 34 as shown in Figs. 2' and 5. The upper part of the cores forming such passages 34 are beveled at l35 to facilitate the removal of the cores from the annular'casting shown in Figs. 7 and 8. Preferably the inner space formed in thefrisers 33 is of greater section than the ring channels 3 1.

In the embodiment shown I have arranged seven layers of segmental cores of six each to complete the circular mold tier for the individual castings. The arrangement of these cores in the second layer is shown in Fig. 3, and the cores are indicated by the reference numerals 36, 37, 38, 39, 40 and 41. Each of these cores 36 to 41 inclusive has the circular channel 31 formed therein to i produce the annular casting, such core surfaces about the channels 31 forming three sides of the rectangular ring casting while the fourth side is produced by the top surfaces of the six cores 25 -to 30 inclusive of the bottom layer as shown in Figs. 1 and 2. As illustrated in Fig. 3 the alternate cores 36, 38 and 40 each have formed therein vertical channels or risers 33 with passages 34 which will vertically aline themselves with the three verticalfrisers 33 and connecting passages 34 in the first layer shown in A three risers 33 is further illustrated in Figs. 1 and 2.

Extending upwardly through the mold flask 16 as shown in Figs. 1 and 2, the several layers of cores 25 to 30 inclusive and of cores 36 to 41 inclusive are alternately arranged one above the other until the layer Fi 5.- Such alinement for the radius than those of the lower cores so as to v form the over-lapping rim 49 for the central trough 42 to prevent any surplus metal flying out of the trough 42 whenl the flask 16 is centrifugally driven as shown in Fig. 2. The opening 50 formed by the top layer cores (43-48) is preferably of the same diameter as that of the opening 19 as shown in Figs. 1 and 2 and the molten metal is poured into the trough 42 through such openings 19 and 50 from any ladle (not shown) after`the several core layers have been assembled and set up within the mold flask 16.

The number of individual segmental cores to form the annular molds for the rings may be widely varied to suit the requirements as to the size and thickness of the ring castings to be produced; also the number of vertical channels or risers7 33, there being a suflicient number to provide suitable reservoirs of molten metal from which the ring casting proper can draw metal through passages 34 upon cooling to obviate undue shrinkage causing imperfections in the completed casting.

Referring to Figs. 7 and 8, Fig. 7 shows a completed ring casting 51 with the three inner riser castings 52 connected to the inner periphery of the ring 51 by the necks 53 formed by the passages 34. When'the group. castings shown in part in Fig. 8 are removed from the mold flask 16, the several necks 53 are cut through to remove the three inner castings 52 and necks 53 and the rings 51 are then ready for further treat ment by splitting and machining same to accurate form and thickness.

The operation of my improved castingmachine isy substantially as follows: After the-separate layers of cores have been arranged within the mold flask 16 as heretofore described to form the central trough 42 and the three vertical risers 33 as shown in Figs. 1 and 2, the cover 18 is secured to the flask which is then placed on the table 15 as shown in Fig. 1. The table 15 is then rapidly revolved and the molten ring metal is poured through the opening 19 into the central trough 42 from which it is driven through the lower gateways '32 into the risers 33 from which the nieta] passes through the connecting passages 34 to the ring channels 31 to produce vthe annular casting 51. Fig. 2 illustrates the filling up of the cores with the ring metal along with the central film of metal on the exterior of the trough 42, the rim 49 preventing this surplus metal from flying out of the moldflask 16 during its rapid rotations. After the molten metal is driven into the channels 31 the outer surfaces cool first and upon shrinkage such ring casting 51 draws to itself through the passages 34 the required amount of metal from the still molten reservoir risers 83 to produce in the finally cooled casting 51 an annulus of uniform thickness in cross-section and of exceptional homogeneity. After the cores and group castings have been removed from the mold flask 16, the separate layers of cores are separated from the castings and the inner riser castings 52 and necks 53 are removed from the inner peripheries of the individual rings a's `hereinbefore eX- plained.

Man variations and modifications may be made in the detailed construction of my improved machine and in the arrangement of the cores within the mold 'flask without departing from the principles of my invention as herein disclosed. Therefore I do not restrict myself to specific features of construction orarrangement of parts which I have herein illustrated and described.

I claim as my invention:

1. In a centrifugal casting-machine, a multiple-casting mold comprising successive layers of cores for forming the rings concentricallyarranged to form an inner trough, a plurality =of vertical channels within the body of the cores connecting the successive layers of cores, and gateways between said trough and channels.

2. In a centrifugal casting-machine, a.

multiple-casting mold comprising successive layers of cores for forming the rings concentrically arranged to form an inner trough, a plurality of vertical channels within the body of the cores connecting the successive layers of cores. and gateways connepting the bottoms of said trough and channe s.

3. In a centrifugal casting-machine, amultiple-casting mold comprising successive layers of cores for forming the rings concentrically arranged to form an inner trough, a plurality of vertical channels within the bod of the cores, of greater section than the rmgs connecting the successive layers of cores, and gateways between said trough and channels.

4. In a centrifugal casting-machine, a multiple-casting mold comprising'successive layers of cores for forming the rings concentrically arranged to form an inner trough, a plurality Aof vertical channels f. within the body of the cores of greater section than the rings connecting the successive layers of cores, and gateways connecting the' bottoms of said trough and channels. t l

5. In a centrifugal castmgfmachlne, a multiple-casting mold composed of`successive layers of ring cores and a plurality of vertical channels within the body of the cores connecting said layers to feed the molten metal to said cores from said channels.

6. In a centrifu al casting-machine, a multiplecasting m ld composed of successive layers of ring cores and a Vplurality of vertical channels within the body of the cores of greater section than said ring cores connecting saidlayers to feed the molten metal to said cores from said channels.

7. In a centrifugal casting-machine, a multiple-casting mold composed of successive layers of ring cores, a plurality of vertical channels within the body of the cores connecting said layers to feed the molten metal to said cores from said channels, and tapered passages between said channels ,and cores. v

8. In a centrifugal casting-machine, a. multiple-casting mold composed of successive layers of ring cores, a plurality of vertical channels within the body of the cores of greater section than said ring cores connecting said layers to feed the molten metal to said cores from said channels, and tapered passages between said channels and cores.

9. In a centrifugal casting-machine, a'

the body of the cores connecting-said layers' to feed the molten metal to said cores from saidVV channels. I

10. In a, centrifugal casting-machine, a multiple-casting mold comprising successive layers of segmental cores for forming the three sides of disconnected mutually parallel rectangular rings concentrieally arranged to form an inner trough and the exposed reverse surfaces of the cores in adjacent layers to form thel fourth sides of the rings, in combination with a plurality of vertical channels within the body lof the cores connecting said layers to feed the molten metal to said cores from said channels.

rings, in combination with a plurality of vertical channels within the body of the cores connecting said laye-rs to feed the molten metal to said cores from said channels.

12. In a centrifugal casting-machine, a

i multiple-casting mold comprising successive `fourth sides of the rings, in combination With a plurality of verticalcliannels Within the body of the cores of greater section than said ring cores connecting said layers'to feed the ,.{molten metal to said cores from said channels.

13. In a centrifugal casting-machine, a multiple-casting mold comprising successive layers of segmental cores for forming the three sides of disconnected mutually parallel rectangular rings concentrically arranged to form an inner trough and the exposed reverse surfaces of the cores in adjacent layers to form the fourth sides of the rings, in combination with a plurality of vertical channels Within the body of the cores of greatersection than said ring cores connecting said layers to feed the molten metal to said cores from said channels.

14. In a centrifugal casting-machine, a multiple-casting mold comprising successive layers of segmental cores for forming the three sides of disconnected mutually parallel rectangular rings concentrically arranged to form an inner trough, and gateways along said exposed reverse surfaces connecting the bottom of the trough with the cores and the exposed reverse surfaces of the cores in adjacent layers to form the fourth sides of the rings, in combination with a plurality of vertical channels within the body of the cores of greater section than said ring cores connecting said layers to feed the moltenI metal to said cores from said channels.

15. In a centrifugal casting-machine, a multiple-casting mold comprising successive layers of cores for forming the three sides of disconnected mutually parallel rectangular rings and the exposed reverse surfaces of the cores in adjacent layers to form the fourth sides of the rings, in combination with a plurality of vertical channels Within the body of the cores connecting said layers to feed the molten metal to said cores from said channels and tapered passages between said channels and ring cores.

16. A rotatable multiple-casting mold having a ring core and a reservoir inside the core but outside the axis of the mold from which metal is drawn during the rotation of the mold.

17. A rotatable multiple-casting mold having a ring core and a reservoir of greater section than said core inside the core but outside the axis of the mold from which metal is drawn during the rotation of the mold. -V

18. A rotatable multiple-casting mold composed of successive layers of ring cores and a common reservoir inside the cores but outside the axis of the mold from which metal is drawn during the rotation of the mold. y

19. A rotatable multiple-casting lmold composed of successive layers of ring cores and a common reservoir of greater section than said cores inside the cores but outside the axis of the mold from Which metal is drawn during the rotation of the mold.

WILLIAM F. WOLF. 

